作　　者： (龙渝川）; (侯鉴珊）; (王玉山）;

机构地区： 重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 重庆大学土木工程学院,重庆400045

出　　处： 《建筑结构学报》 2017年第9期147-153,共7页

摘　　要： 应用连续介质损伤力学和塑性流动理论,建立了基于能量耗散机制的塑性-损伤耦合模型。模型采用非关联塑性流动法则描述混凝土不可恢复变形的演化。模拟刚度退化的损伤变量演化函数则通过断裂能和应力-非弹性应变空间中的累积耗散能量建立。基于有限元程序ABAQUS,推导了增量格式的材料雅可比矩阵,构建了塑性-损伤模型的仿真分析程序。应用模型分析混凝土板平面内双轴受压试验、混凝土切口梁试验和钢筋混凝土梁受弯试验,计算获得的构件响应与试验结果吻合良好,能够反映多轴应力状态对混凝土抗压强度的影响,也能准确模拟损伤导致的构件非线性反应。 A plastic-damage model was developed by using essential concepts of continuum damage mechanics and plastic flow theory. It employs a non-associated plastic flow rule to simulate the evolution of irrecoverable deformation The evolutionary function of damage variable to model stiffness degradation was given in terms of the fracture energy and accumulated dissipated energy calculated according to the stress-inelastic strain relation. This model was implemented into ABAQUS, with the derivation of Jacobian matrix of material in rate form. This model was used to analyze biaxial compressive test of concrete slab, three-point-loading notched beam test and flexural test of reinforced concrete beam. Numerical results agree well with those obtained from tests. It is concluded that the plastic-damage model can represent the effects of multi-axial loading state on the compressive strength and simulate the nonlinear structural response due to damage.

关 键 词： 混凝土 损伤力学 塑性力学 塑性 损伤模型 仿真模拟